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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf03a0e56553f4525736366526481637db0a94e90bba48dda8ebf6300e418fa' 
  AND token = 'c3ULMFVfpi/5Sl9kryxWKq6+pWUHMFn7BtEMnmMG3dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}